CVE-2025-25058: Intel Ethernet 800 ESXi Driver Disclosure

CVE-2025-25058 Overview

CVE-2025-25058 is an improper initialization vulnerability affecting the ESXi kernel mode driver for Intel Ethernet 800-Series network adapters. This driver-level flaw exists in versions prior to 2.2.2.0 (ESXi 8.0) and 2.2.3.0 (ESXi 9.0), and may allow information disclosure through local access by an authenticated user with low privileges.

Critical Impact

Local authenticated attackers may exploit improper initialization in the Intel Ethernet 800-Series ESXi driver to expose sensitive data, potentially compromising system confidentiality in virtualized environments.

Affected Products

• Intel Ethernet 800-Series ESXi kernel mode driver versions before 2.2.2.0 (ESXi 8.0)
• Intel Ethernet 800-Series ESXi kernel mode driver versions before 2.2.3.0 (ESXi 9.0)
• VMware ESXi 8.0 and 9.0 environments using affected Intel Ethernet drivers

Discovery Timeline

• 2026-02-10 - CVE-2025-25058 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2025-25058

Vulnerability Analysis

This vulnerability stems from CWE-665: Improper Initialization, a weakness where software fails to properly initialize data, memory, or other resources before first use. In the context of the Intel Ethernet 800-Series ESXi kernel mode driver, this improper initialization occurs within Ring 1 (Device Drivers), which operates at a privileged level within the processor's protection ring architecture.

The vulnerability requires local access to the affected system and an authenticated user context. While the attack complexity is low, certain attack requirements must be present for successful exploitation. No user interaction is required for the attack to succeed, and no special internal knowledge of the system is necessary.

The impact is limited to confidentiality exposure with low severity—integrity and availability remain unaffected. This means an attacker could potentially read sensitive information from uninitialized memory regions, but cannot modify system data or cause service disruption through this specific vulnerability.

Root Cause

The root cause is improper initialization (CWE-665) in the ESXi kernel mode driver code for Intel Ethernet 800-Series adapters. When the driver allocates memory or initializes data structures, it fails to properly clear or set initial values before use. This can leave residual data from previous operations accessible to subsequent read operations, potentially exposing sensitive information that was stored in those memory locations.

Attack Vector

The attack vector is local, requiring the adversary to have authenticated access to the affected ESXi host. The attack scenario involves:

1. An authenticated but unprivileged user gains local access to an ESXi system running the vulnerable Intel Ethernet 800-Series driver
2. The attacker triggers operations that interact with the improperly initialized driver components
3. Through careful manipulation of driver calls, the attacker can read memory regions that contain data from previous operations
4. This exposed data may include sensitive configuration information, network traffic fragments, or other confidential data processed by the Ethernet driver

The vulnerability manifests in the driver's initialization routines where memory buffers and data structures are not properly cleared before use. For detailed technical information about this vulnerability, refer to the Intel Security Advisory SA-01408.

Detection Methods for CVE-2025-25058

Indicators of Compromise

• Unusual local process activity attempting to interact with Intel Ethernet 800-Series driver interfaces
• Unexpected memory access patterns in ESXi kernel driver space
• Anomalous read operations targeting network driver memory regions
• Authentication events followed by driver interaction from low-privileged accounts

Detection Strategies

• Monitor ESXi host logs for unusual driver initialization or reinitialization events
• Implement file integrity monitoring on Intel Ethernet driver files to detect unauthorized modifications
• Enable verbose logging for network driver operations to capture potential exploitation attempts
• Use SentinelOne Singularity platform to detect anomalous process behavior and memory access patterns at the hypervisor level

Monitoring Recommendations

• Audit local access to ESXi hosts and restrict authentication to necessary personnel only
• Configure centralized logging for ESXi systems to capture driver-related events
• Implement network segmentation to limit exposure of management interfaces
• Review and monitor driver version information across ESXi infrastructure to identify unpatched systems

How to Mitigate CVE-2025-25058

Immediate Actions Required

• Inventory all ESXi 8.0 and 9.0 hosts using Intel Ethernet 800-Series adapters
• Verify current driver versions and identify systems running versions below 2.2.2.0 (ESXi 8.0) or 2.2.3.0 (ESXi 9.0)
• Prioritize patching based on the sensitivity of workloads running on affected hosts
• Restrict local access to ESXi hosts to minimize the attack surface

Patch Information

Intel has released updated ESXi kernel mode drivers for the Ethernet 800-Series to address this vulnerability. Organizations should upgrade to driver version 2.2.2.0 or later for ESXi 8.0 environments, and version 2.2.3.0 or later for ESXi 9.0 environments. Detailed patching instructions and driver downloads are available through the Intel Security Advisory SA-01408.

Workarounds

• Implement strict access controls to limit local authentication to ESXi hosts
• Apply the principle of least privilege for all users with ESXi access
• Consider isolating affected ESXi hosts from sensitive network segments until patches can be applied
• Enable enhanced security logging and monitoring to detect potential exploitation attempts

# Example: Check Intel Ethernet driver version on ESXi
esxcli software vib list | grep -i intel
# Review driver version and compare against patched versions:
# ESXi 8.0: 2.2.2.0 or later
# ESXi 9.0: 2.2.3.0 or later